According to the law, the lawful permanent residents are expected to reside in the United States permanently. At times a person who happens to be a lawful permanent resident or a conditional permanent resident may have to travel extensively or stay abroad in another country for a long period of time which may range from a few months to a few years. For such residents, a Reentry Permit is issued. This document called Reentry Permit allows the holder to retain or keep the status of LPR (lawful permanent resident) intact while they are outside the United States.
The U.S. Reentry Permit is a passport-like document which has a temper proof page with the resident’s photo and another biographic page followed by a number of pages for stamping.